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// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package keystore
import (
"io/ioutil"
"os"
"path/filepath"
"strings"
"sync"
"time"
mapset "github.com/deckarep/golang-set"
"github.com/dexon-foundation/dexon/log"
)
// fileCache is a cache of files seen during scan of keystore.
type fileCache struct {
all mapset.Set // Set of all files from the keystore folder
lastMod time.Time // Last time instance when a file was modified
mu sync.RWMutex
}
// scan performs a new scan on the given directory, compares against the already
// cached filenames, and returns file sets: creates, deletes, updates.
func (fc *fileCache) scan(keyDir string) (mapset.Set, mapset.Set, mapset.Set, error) {
t0 := time.Now()
// List all the failes from the keystore folder
files, err := ioutil.ReadDir(keyDir)
if err != nil {
return nil, nil, nil, err
}
t1 := time.Now()
fc.mu.Lock()
defer fc.mu.Unlock()
// Iterate all the files and gather their metadata
all := mapset.NewThreadUnsafeSet()
mods := mapset.NewThreadUnsafeSet()
var newLastMod time.Time
for _, fi := range files {
path := filepath.Join(keyDir, fi.Name())
// Skip any non-key files from the folder
if nonKeyFile(fi) {
log.Trace("Ignoring file on account scan", "path", path)
continue
}
// Gather the set of all and fresly modified files
all.Add(path)
modified := fi.ModTime()
if modified.After(fc.lastMod) {
mods.Add(path)
}
if modified.After(newLastMod) {
newLastMod = modified
}
}
t2 := time.Now()
// Update the tracked files and return the three sets
deletes := fc.all.Difference(all) // Deletes = previous - current
creates := all.Difference(fc.all) // Creates = current - previous
updates := mods.Difference(creates) // Updates = modified - creates
fc.all, fc.lastMod = all, newLastMod
t3 := time.Now()
// Report on the scanning stats and return
log.Debug("FS scan times", "list", t1.Sub(t0), "set", t2.Sub(t1), "diff", t3.Sub(t2))
return creates, deletes, updates, nil
}
// nonKeyFile ignores editor backups, hidden files and folders/symlinks.
func nonKeyFile(fi os.FileInfo) bool {
// Skip editor backups and UNIX-style hidden files.
if strings.HasSuffix(fi.Name(), "~") || strings.HasPrefix(fi.Name(), ".") {
return true
}
// Skip misc special files, directories (yes, symlinks too).
if fi.IsDir() || fi.Mode()&os.ModeType != 0 {
return true
}
return false
}
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